The supermoon was seen behind clouds over the US Capitol in Washington, D.C.

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The moon rose behind the Las Vegas Strip.

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The supermoon seen from the Astro-Physical Institute of the Canaries in Teide volcano of Tenerife, in the Canary Islands, Spain.

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The supermoon appeared above the Colosseum and the Santa Francesca Romana Basilica belltower in Rome Sunday.

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People gathered to watch the moon rise in Woods Hole.

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The Moon rises next to a Saturn 1B rocket at the US Space and Rocket Center in Huntsville, Ala.

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It officially became full at 2:09 p.m. EDT, though it was expected to appear full tonight.

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A woman took a selfie with the supermoon and London's Tower Bridge in the background.

YORGOS KARAHALIS/Reuters

This moon is also called the Sturgeon Moon, because of the abundance of sturgeon in the Great Lakes and Lake Champlain at this time of year. Pictured: The Temple of Poseidon in Cape Sounion, east of Athens.

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This is the second supermoon of the year. Pictured: The moon rose over the Sydney Opera House in Australia.

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A NASA scientist recommended watching the phenomenon right at moonrise, when skies are most likely to be clear. Pictured: Madrid.

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The supermoon behind the Christ the Redeemer statue in Rio de Janeiro, Brazil.

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The moon was expected to rise at 7:55 p.m. and set at 7:20 a.m. Monday. Pictured: Beijing.

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Once it is high in the sky, observers should not expect to see much of a difference between this full moon and others. Pictured: The Colosseum and the Roman Forum.

John Sleezer/The Kansas City Star, via AP

The moon rises above Kansas City, Mo., during its closest point to the earth.